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At Another Mark:
Fee Disclosure

The fees levied by 401(k) retirement-savings plans are coming under increased scrutiny amid allegations that investors are being overcharged.

Last month, separate lawsuits were filed against nine corporations, including Boeing Co. and Lockheed Martin Corp., in U.S. district court in Illinois, alleging that certain revenue-sharing arrangements with 401(k) providers broke the law. At the same time, the Labor Department, which regulates retirement plans, is considering a rule that could force companies that administer these...